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Ionic liquid-chemical combined degumming method

An ionic liquid and chemical degumming technology, applied in the field of textile processing, can solve the problems of unsatisfactory degumming effect, long time-consuming degumming process, poor pretreatment effect, etc., and achieve low production cost, easy recycling and stable performance.

Inactive Publication Date: 2014-12-24
DALIAN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems in the prior art that the hemp degumming process has great pollution to the environment, the degumming process takes a long time, and the subsequent degumming effect is not ideal due to the poor pretreatment effect, the present invention provides an ionic liquid-chemical combined degumming method, the process Simple, low production cost, less pollution

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Pretreatment: First, add the raw apocynum hemp into deionized water according to the bath ratio of 1:20, boil it in water at 70°C for 3 hours, wash it, and then add [Bmim][ OAc] in an aqueous solution of ionic liquid, mechanically stirred, reacted at 90° C. for 4 hours, cooled to room temperature, separated by filtration, and the obtained hemp fiber was washed and dried. The original gum content of Apocynum hemp is 53.93%, and the residual gum rate after pretreatment is 27.06%.

[0028] Chemical degumming: add hemp fiber obtained after pretreatment to lye (NaOH 8g / L, NaOH 5 P 3 o 10 2.5%, bath ratio 1:20, temperature 90°C) for the first boiling and stirring for 1.5h, washed with water, and then for the second boiling (NaOH 12g / L, NaOH 12g / L, NaOH 5 P 3 o 10 2%, bath ratio 1:20, temperature 90°C) and stirred for 2.5h, then washed, dried, knocked and kneaded to obtain degummed Apocynum, and the residual glue rate was 3.95%.

[0029] The filtrate obtained during the ...

Embodiment 2

[0032] Pretreatment: First, add the raw apocynum hemp into deionized water according to the bath ratio of 1:20, boil it in water at 70°C for 3 hours, wash it, and then add [Bmim][ OAc] in the ionic liquid aqueous solution, mechanically stirred, reacted at 50° C. for 3 hours, cooled to room temperature, separated by filtration, and the obtained hemp fiber was washed and dried. The original gum content of Apocynum hemp is 53.93%, and the residual gum rate after pretreatment is 35.55%.

[0033] Chemical degumming: the gained hemp fiber is added to lye (NaOH 8g / L, NaOH 5 P 3 o 10 2.5%, bath ratio 1:20, temperature 90°C) for the first boiling and stirring for 1.5h, washed with water, and then for the second boiling (NaOH 12g / L, NaOH 12g / L, NaOH 5 P 3 o 10 2%, bath ratio 1:20, temperature 90°C) and stirred for 2.5h, then washed, dried, knocked and kneaded to obtain degummed apocynum, and the residual glue rate was 4.05%.

[0034] Add 5 times the volume of hot water at 80°C to ...

Embodiment 3

[0037] Pretreatment: First, add the raw apocynum hemp into deionized water according to the bath ratio of 1:20, boil it in water at 70°C for 3 hours, wash it, and then add [Bmim][ OAc] in the ionic liquid aqueous solution, carry out mechanical stirring, at 70 ℃ temperature, after reacting for 2h, drop to room temperature, filter and separate, the gained hemp fiber is washed and dried, the original gum content rate of Apocynum hemp is 53.93%, after pre-treatment After treatment, the residual glue rate was measured to be 34.96%.

[0038]Chemical degumming: the gained hemp fiber is added to lye (NaOH 8g / L, NaOH 5 P 3 o 10 2.5%, bath ratio 1:20, temperature 90°C) for the first boiling and stirring for 1.5h, washed with water, and then for the second boiling (NaOH 12g / L, NaOH 12g / L, NaOH 5 P 3 o 10 2%, bath ratio 1:20, temperature 90°C) and stirred for 2.5h, then washed, dried, knocked and kneaded to obtain degummed apocynum, and the residual glue rate was 3.94%.

[0039] Add...

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Abstract

The invention discloses an ionic liquid-chemical combined degumming method. The method comprises the following steps: mixing raw hemp and water and boiling the mixture with water first, then mixing the dried boiled mixture and an ionic liquid aqueous solution, and performing stirring treatment for 2 to 4 hours at the temperature of 40 to 120 DEG C; filtering and separating the mixture, washing the obtained solid with clean water, and drying; performing chemical degumming treatment on the obtained solid, wherein the ionic liquid is of an A<+>B<-> structure, the cation A<+> is of the structure shown in the general formula I, R1 and R2 in the general formula are respectively and independently selected from alkane or alkene of C1 to C5; the anion B<-> is acetate. According to the ionic liquid-chemical combined degumming method, pretreatment is performed through ionic liquid; the hemp degumming pretreatment effect is good; the colloid content of the raw hemp can be effectively reduced; after the pretreatment, the colloid in hemp can be reduced by about 20 percent; subsequent degumming treatment of hemp fibers is facilitated; the damage to the raw hemp is low; ionic liquid degumming and chemical degumming are performed in a combined manner, so that degummed hemp fibers with higher performance can be obtained, and the environment pollution can be reduced.

Description

technical field [0001] The invention relates to an ion liquid-chemical combined degumming method of hemp bast fiber, which belongs to the field of textile processing. Background technique [0002] With the development and progress of modern society, people pay more and more attention to the problem of environmental pollution, especially the stricter environmental requirements for the textile dyeing and finishing industry. Therefore, textile enterprises pay more and more attention to green and pollution-free production processes. Because hemp fiber has many advantages, it has been an important raw material in textile production since ancient times. The degumming of hemp fiber is the basis for its development and utilization. The excellent performance of hemp fiber is directly related to the degumming effect. The degumming effect of hemp fiber has an important impact on the physical and chemical properties of the fiber, spinning process, yarn quality and product wearability. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01C1/02
Inventor 赵玉萍杨锋锐马英冲郑来久杜冰叶方侯箫箫
Owner DALIAN POLYTECHNIC UNIVERSITY
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